Water-heater construction.



' WITNESSES:

F. L. 0! WADSWORTH.

WATER HEATER CONSTRUCTION. APPLICATION man 00 124. 1912.

PatentedJ 1 2(),1915.

SHEET L INVENTOR.

F. -L. 0. WAD-SWORTH. WATER HEATER cousmucnon; APPLICATION F-lLED OCT. 24. 1912.

Patented July 20, 1915.

i I I 4 I I I a z I I v jf p I I I I a I a 4 I I v ,l'tjl I I 4 I I a r I I a I I I I I I I l a l I mvzrngn Patented July 20, 1915.

I 4 SHEETSSHEET 3.

INVINTO] F. L. 0. WADSWORT-H. WATER HEATER cousmucnofi.

APPLICATION FILED 06124, I912.

Patented July 20, 1915.

BEST AVAILABLE COPY UNITED STATES PATENT OFFICE,

FRANK L. O. WADSWORTH, OF SEWI'CKLEY, PENNSYLVANIA.

WATER-HEATER CONSTRUCTION.

Application filed October 24, 1912. Serial No. 727,510.

To all whom it may concern:

Be it known that I, FRANK L. O. lVADs- WORTH, a citizen of the United States, residing at Sewickley, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in nter-Heater Construction, of which the followingis a specification.

The invention relates to improvements in water heaters, and particularly to the automatic controlling mechanism therefor. It has for its .primary objects, the provision of a combined pressure and thermostatic controlling means in which the number of parts is reduced to a minimum and a most compact arrangement of parts secured; and the provision of a controlling means in which the pressure and thermostatic means are closely and positively associated and a direct and reliable actuation of the gas valve is secured. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein Figures 1 and 2 are front and side eleva tions respectively of a common form of instantaneous water heater, with one form of my improvement applied thereto; Fig. 3 is an enlarged longitudinal section through the combined thermostatic and Water pressure controlling means employed in the construction of Figs. 1 and 2; Figs. 4, 5, 6, 8 and 9 are sections similar to that of Fig. 3, through modified forms of thermostatic and water pressure controlling means applicable to the heaters shown in Figs. 1 and 2 in place of the construction of Fig. 8; Fig. 6 is a perspective view of one of the operating bars employed in the construction of Fig. 5; Fig. 7 is a section on the line VIII-VIII of Fig. and Fig. 10'is a section on the line XI- XI of Fig. 9.

The primary distinguishing feature of the present invention as compared with other constructions of which I am aware, wherein both thermostatic and pressure means oper atea common gas valve, resides in the carrying of one of the controlling means bodily by the other, so that either the watered ed element is shifted bodily by the thernr. iatic means and its effect upon the gas valve is modified by,such bodily shiitt in position, or the thermostatic element is shifted bodily by the water-actuated means, and its effect upon the gas valve is modified by such bodily shift of position. My invent on contemplates either of these broad alternative constructions, and the various drawings forming a part of this specification illustrate a few of the various possible em bodiments of the broad invention.

Referring first to the general arrangement of the heater parts as shown in Figs. 1 and 2; A is the casing of the heater; B indicates the upper coils of the heater; C is the lower reverse coil connected to the upper coils by controlling means; L is the cold water inlet pipe leading from the main to the heater; M is the hot water outlet pipe leading to the house faucets; X is the hot water outlet pipe leading from the lower reverse coil C to the thermostat casing K, from which casing the water passes out through the house supply pipe M,- and O is the usual pilot light connection leading to a pilot light (not shown) such as is common in all instantaneous heaters.

efcrring now to Fig. 3 of the drawing in connection with Figs. 1 and 2, 1 is the water actuated pressure member carried by the casing I, such water actuated member being in the form of a piston held in its upper position by means of the spring 2. The upper side of this piston is exposed to water main pressure from the inlet pipe L, while the lower side of the piston has connection by means f the passage 3 with the pipe N of the heater, so that when the outlet from the heater is opened and the pressure therein reduced the piston 1 will move downward overcoming the pressure of the spring 2. A gas valve 4 is provided in the casing G nor mally heldcloscd by the spring 5, and this valve is opened when the piston 1 moves down by means of the following connections. .liston 1 has scrcwthrcaded to its lower interior portion the upwardly extending tube Specification of Letters Patent. Patented July 20, 1915.

conducting material so as to avoid as far as possible the direct communication of heat from the tube 6 to the tube 7 This sleeve may, however, be dispensed with and the two tubes joined by a single tube 9. The lower end of the downwardly extending tube 7 has secured thereto the block 11 which slides inside thetube and carries the rod 12, such rod 12 serving to operate the thermostat levers 13. From the foregoing it will be seen that when the outlet from the heater is opened and the piston 1 moves down the tubes 6 and 7 with the rod 12 carried thereby will: move down and actuate the thermostat lever 13 to open the gas valve 4:, thusadmitting a supply of gas to the burners to heat the water flowing through the coils of the heater. As the piston 1 moves down its tapered inner surface moves away from the tapered. plug 11, thus permitting the water .to flow through the slots 15 in the lower end of the tube (3, and the opening 16 through the end of the block 11 to the interior of the tube 7. Passing up through this tube 7, the' water enters the short connection 17 leading to the top coil B of the heater (Fig. 1). The ball check valve 18 at the lower end of the tube 7 serves to prevent any baclrfiow of water through such tube 7.

The manner in which the thermostatic control. .is secured will now' be readily understood. The tube 6 is preferably made of a material having a high coefficient of expansion, and the hot water flowing from the pipe N to the pipe M passes around the tube 6 and causes it to contract or expand, ac cording to the temperature of the outflowing water.- If while the piston 1 is down and the main gas valve 1-1 is open, water being at such time wit lrawn from the. heater, such waterrises above the predetermined temperature for which the thermostat is set, the tube 6 will expand. and move the tube 7 upward a sullicient distance to withdraw the rod 12, thus permitting the spring 5 to close the-gas valve and shut oil the supply of gas to the burners. When the temperature of the flowing Water'once more falls below the point of thermostatic cut offthe contraction of the tube 6 will move the follows.

ing out at the connection N, up through the casing K around the thermostat tube 6, past the valve 19 and back through the passage.

17 to the upper coil B of the heater; A continuous circulation is secured in this manner even when the outlet from the heater is not opened. At other times when the outlet from the pipe M is open, the valve 19 will be closed, thus preventing incoming cold water from the tube 7 from byassing from the upper end of such tube to the pipe M.

i To summarize briefly, the operationis as Starting with the water the heater at a temperature below its predetermined point, with the outlet from the pipe M closed, and with the parts in the position indicated in big. 3. If now the outlet from the pipe M be opened, the pressure upon the lower side of the pistonl will be re duced by virtue of the connection 3, and the piston will move down under the infiuence of the pressure from the main. As the piston 1 moves down the water supplied, from the inlet pipe L passes through. the slots 15, the 'openin 16, and up through the tube 7 to the inlet 1 of the heater, the valve 19 at such time-being permitted to close by reason of the downward movement of the tube 6 carried by the. piston 1. This downtube 7 and the rod 12 downward. and once.

more open the gas valve, admitting a fresh supply of gas to the main burner where it will be ignited.

In order to permit a circulation of the water in the coils of the heater when the outlet from the pipe M is notopen, the valve 19 is provided, such valve being actuated by the spring .20 and being normally held in the position indicated in when the piston 1 is in its upper position, that is,

. when no water is being withdrawn from the heater.

At this time it will be seen that the water heated in the lower reverse coil C by ward movement of the tube 1 also'moves down the tube? carried by the tube 6, thus causing the rod 12 to engage the thermostat lever 13 and open the valve 4. Gas is thus admitted to the bu:.:-'=.er; of the heater, and the water, flowing from the connection 17 through the upper coils B and the lower re verse coils C to the connection N is heated, such water then passing up through the easing around the thermostat tube 6 to the outlet pipe M. It new water fiowing through the casing K to the outlet M becomes heated to too high a temperature, the expansion of the tube 6 will carry the tube 7 and the rod 12 upward, thus permitting the spring 5 to close the gas valve and shut oil the supply. of gas to the burnersx Similarly, if the piston lis accidentally stuckin open position after the outlet from the heater is closed.

Under such conditions due to the nonsupply of cold water ,to the heater, the water in the heater will become overheated, thus causing the expansion of the thermostat tube 6 to such an extent that the tube 7 and the rod 12 will be moved upward, thus permitting the gas valve 1 to close. An added safety control is provided by the use of the ball check valve 18 which prevents any back flow of the water from the heater coils into the cold water supply and causes the expansion of the water itself to act upon the under side of the piston 1, thus forcing it to its closed position and lifting all of they parts out of engagement with the gaswl. valve lever 13. It will be noted that'in'the construction just described the thbrmostatiq 1" element 6 is carried bodily by thewater actuated element 1, and that the construction by reason of this arrangement is very compact and simple, and that the operation is absolutely positive. It will also be noted that the necessity for the counterbalancing springs and other complicated mechanism ordinarily required where there is a single valve controlledboth by thermostat and by a Water with.

Fig. 4 illustrates a very compact form of apparatus wherein the thermostatic element is carried by the water actuated element as in the types of apparatus heretofore described, the thermostatic element being in this case a liquid one, of the corrugated box type. In this apparatus F is the gas supply pipe; G is the gas valve casing which carries the gas valve 4 and the spring 5 for normally holding the valve closed; H is the gas pipe leading from the gas valve casing to the burners of the heater; K is the casing containing the water actuated piston 1 L is the cold water supply pipe pressure member is thus dispensed leading into the casing K 17 2 is the outlet.

from the casing K leading to the top coil .of the heater; N is the connection leading from the lower reverse coil of the casing K M is the hot water outlet pipe from the apparatus; and 7 7 are a pair of concentric corrugated thermostat tubes, the opening between which is filled with some liquid having a relatively high coeflicient of expansion. The piston 1 is in the form of a box having an inlet port 36 opposite the end of the connection N and an outlet port 37 at the forward end of the piston, between the plate 38 and tube 39. The piston 1 is normally held in the position shown by means of the springs 40 and 41. The port 42 provides for communication between the pipes LE and 17 when the piston movesto the right upon the opening of the outlet from the heater, and the port 43 leading to the recess around the periphery of the piston pro vides for a communication between the pipes N and 17 when the outlet from the heater is closed, so that a continuous circulation from the bottom to the top coils of the heater may be secured when no water is flowing from the heater. The front ends of the thermostat tubes 7* are secured to the plate 38 of the piston, and carry at their rear ends a plate 44 secured to the tube 39, such tube 39 being perforated as indicated, to

provide for the passage of water to the outlet port 37. The tube 39 is secured at its front end to another tube 45 closed at itsrear end and carrying the rod 46, such rod 46 being adapted to engage the stem 47, Stem 47 is provided with a split collar '48 adjustable on the rod and adapted to engage the stem of the gasvalve 4 The flange 49 serves as a stop for limiting the forward past the thermostat casing movement of the piston, and is provided with perforations 50 to permit of the passage of water from the interior of the'piston to the pipe N when the plate %8 is against the stop flange. It will be seen that the position of the rod 46 from which the gas valve is operated is regulated by the expansion and contraction of the liquid in the thermostat tubes 7 2 which are free to expand rear-i \vardly carrying the plate 44 and the rod 46 to the left as the temperature of water in side the'piston rises, and are also free to contract under the water pressure, carrying the said plate and rod to the right as the temperature falls. y

When the outlet from the pipe M is opened the pressure upon the front side of the piston is reduced and it moves forward, uncovering the port 42 and permitting a flow of water through the heater. This forward movement of the piston causes the rod 46 to engage the rod 47, and this rod in turn engaged the stem of the gas valve and opens it. As in the case of the mechanisms previously described, the parts a so adjusted that this opening of the gas valve occurs just prior to the arrest of the valve actuated member and the parts carr ed thereby, by the stop provided for that purposein this case by the stop member 49. The water from the heater passes through the connection N and through the port 36 into the interior of the piston 1 The'vvater thus supplied to the interior of the piston circulates 7 passing through the perforations in the tube 39 and out at the front end 'of such tube, from which point it passes to the pipe M If the water in the piston rises above a predetermined temperature the expansion of the easing 7 carries the plate 44 and the rod 46 to the rear far enough to allow the gas valve to close. \Vhen the temperature falls the contraction of the liquid in the thermostat box allows this box to shorten under the pressure of the water and thus move the rod -46 to the right and once more open the gas valve. The thermostatic action of the liquid in the box formed by the tubes 7- 7 2 can be supplemented if desired by making the'tube 45 of some material having a high coefficient of expansion and 'the rod 46 of material with a low coefficient of expansion.

When the piston 1 is in its'forward position Fig. 5 illustrates another modification ofthe invention, the arrangement as heretofore described, however, being reversed in that the water actuated member is carried. by

the, thermostat instead of the thermostat be- I ingcarried by the water actuated member.

In this apparatus the. water actuated member is a diaphragm instead of a piston, and

burners; K is the casing containing the.

controlling mechanism; L is the cold water inlet pipe; 17 is the pipe leading from the casing to the'top coils of the heater: N is the connection leading from the lower reverse coil of the heater to the casing; T is the thermostat past which the water from the connection N flows on'its way to the hot water outlet pipe M;-and 1 is the diaphragm of the water actuated member. The water actuated diaphragm 1 carries a tube 52 provided with perforations 53 and a screw cap 54 which in turn carries the stem 55 having a lost motion connection with the stem of theyalve l". 51 is normally held in its rearmost position by means of the spring 56. and at its front end has a. collar 5? which makcsa. sliding packed engagement with the wallsoi the chamber 58 with which the pipes L and 17-communicate. The diaphragm 1 is normally held in its forward position by means of the spring 59. and when such diaphragm is in its rear position the rear end of the tube 52 is closed by the valve stop (30. (ommunicationv lwtwcen, the interior of the casing 51 and the chamber surrounding the casing is bad through the perforations G1.

The thermostat 7 consists of a plurality of tubes 61. (12. 63. (34. 65. (HS. (37, and 8 alternating with bars 67 having their ends booked in opposite directions as indicated at 70 and 71 (Fig. (3). The inner tube (ll is screw threaded at its front end to thc' casing 5l.-whilc at its rear end is slidingly guided upon the projecting hcad '72. while the outer tube li is scoured at its rcar end to the casing Kt. it will be sccn that an expansion oi the outer tube (3H will carry the front end of such tube forward and thus carry with it the. hooked end of the bar (37. The position of the other end oi this bar 67 fixes the position of the next tube (12. and the action of .this tube. with respect to the next tube is the same as that just described. As a result a. multiplication of movement is secured. the inner tube (31 being moved a distance equal to the sum of the changes in length of the connecting bars 67. it being understood that the materials from which the tubes and bars are made is selected so as to give. as large a difference in thc cocllicicncc. of expansum as is possible. From the foregoing it will be seen that the gas valve is actuated by the movement of the diaphragm 1, but that the actuation of the The casing I gas valve by the diaphragm is governed by the position of the casing 51 carrying the diaphragm, and that such position is con trolled by the thermostat.

\Vhen the outlet from the pipe M is opened the pressure on toe right hand side of the diaphragm 1' is reduced by reason of the. port (31, and pressure on the front side oi the diaphragmoverbalancmg that on the rear side. the diaphragm. moves to the i right until .it is stopped by the valve head (it). the parts being so adjusted that the find movement opens the gas valve and permits a. low of gas to the burners of th heater. At this time water flows from the pipe N past the thermostat 7," to the hot water outlet pipe MZ thus giving a. control of the thermostat by the outliowing water. If new the temperature of the outflowing water rises above a predctcrmincd point the. inner tube (31 carrying the diaphragm casing 51 moves to the. left, carrying with it the diaphragm and so permitting the gas valve to be closed by the spring 53 thus shutting off the gas supply. \Vhcn the temperature of the flowing watc-r falls the differential con-- traction of the thermostat elements moves the casing and its attached parts to the right. thus pulling opc-n'the gas valve and admitting a fresh supply of fuel to the main heating b icrs.

lVhen 11:; out-let from the heater is closed and the parts are restored to the position shown in Fig. 5 the perforated tube 52 per mits the water to circulate between the outlet pipe N and the inlet pipe 17 but this connection is cut ofl when the outlet from the heater is opened and the diaphragm .1 moves to the right. as at such time the valve ($0 closes the cud oi the tube Tr). The a-r rangemcnts of the bars 67 with respect to the tubes will be readily understood by reference to Fig. 7 which shows. the bars and tubes in cross section.

Fig. 3 illustrates another arrangement wherein the position of the water valve is regulated by means of-the thermostat. the movable water actuated means being carried in such case by the thermostat as in the construction of Fig. 5. is the gas inlet pipe leading to the valve cas- In this apparatus F.

ing (l provided with the gas valve 4. and 1 is the connection leading from the lower coil of the heater. and M 4 is the hot water outlet pipe. The water actuated member in this case is a. piston 1* which is normally held in forward position by means of the spring 7'2. the casing 73 which carries the piston 1" being itself slidably mounted in the easing li" and being carried by the thermostat as hereinafter described. The piston 1 has lost motion connection with the gas valve 4 by means of the stems 74 and 75 adapted to cooperate as indicated in the drawing. The wall of the member 73 is provided with a port 76, and the wall of the casing K is provided with a passage 77 leading upward, whereby communication is had through the upper portion of the casing K to the connection 17* leading to the top of the heater. The expansible portion of the thermostat consists of a pair of concentric corrugated tubes 78 and 79 secured at their upper ends to the casing K and at their lower ends to theuppcr end of the casing 73, so that the position of the lower end of the corrugated tubes regulates the position of the casing 73 which carries the water actuated member 1. Communicating with the upper end of the annular chamber formed between the members T8- and T9 is another annular chamber formed by the tubes 80 and 81 connected together at their upper ends by means of the collar 82 which slides in the union 83. These two comnnmicating chambers are completely filled with a liquid having a high cordlicient of expansion such as petroleum; parallin oil. etc. lorts R4 and 85 form a means of communication from the connection N to the interior of the tube 81. and the upper end of this tube 81 communicates with the outlet pipe M. The ports 86 in the upper end of the member 73 provide a means whereby the upper side of the water actuated piston 1 is exposed to the pressure of the water in the v heater. From the foregoing it will be readily understood that the position of the easing 73 of the water actuated member is regulated and governed by the thermostat, and that the movement of such member 73 is determined by the expansion and contraction of the liquid in the chamber formed by the orrugated tubes 78 and 79 and the tubes 80 and 81. i

In operation. when the outlet from th'c heater is opened. the pressure upon the upper side of the piston 1* is reduced and the piston moves upward. thus uncovering the port 76 and permitting a'fiow of water through such port to the passage 77 and thence up-' ward to the connection 1? leading into the heater. This upward movement of the piston 1* causes the opening of the gas valve 4 and permits a How of gas to the burners of the heater, the upward piston movement being arrested and determined by the engagement of the piston hub with the head of the casing 73. If during the og'ier'ation of the apparatus the temperature 0 the .water becomes too'great the liquid in the chambers between the tubes 78 and 79, and 80 and 81,

expands, causing the lower ends of the tubes 78 and 79 to move downward and shifting the position of the casing 73 downward. This of course changes the position of the 76 to move down. permitting the closing of the gas valve. hen the temperature falls there is a reverse or reciprocal movement of the casing which allows the gas valve to be again opened by the pressure on the valve actuated element 1.

\Yhen the piston l is in its lowest position the upper edges of the ports 76 are uncovered. thus allowing a free circulation of the water through the heater coils from the outlet N, the parts 94, S6. 76 and T7, to the inlet 17'. \Vhcn the piston is raised this circulation is prevented. by the covering of the upper edges of the ports 76 by the piston.

Figs. 9 and 10 indicate another modification of the apparatus. in which the water actuated member is carried by the thermostat. the water actuated member in the pres ent case being a diaphragm instead of a pis ton. in this construction ll is the gas inlet pipe leading to the casing (i provided with the gas valve 4 held normally in closed position by the. spring 53 F is the pipe leading from the gas valve ca ing to the burners: K? is the casing containing the controlling mechanism; If is the cold water inlet pipe from the main leading into the casing; 17 is the connection leading from the casing K to the upper coil of the l ater; N is the connection leading from the lower coil of the heater for conducting the hot water to the casing K: M is the hot water outlet pipe; and 1 is the water actuated diaphragm. in this type of apparatus the thermostat consists of the corrugated tube 86 connected at its rear end with the four pipes 87, the tubes S6 and ST being filled with a liquid having a relatively high coeiiicient of expansion. and the tubes having a communicating cap 86 at the upper end. The volume of the liquid in the thermostat may be adjusted by means of the screw 89. The front end of the corrugated tube 96 carries the casing 90, which casing 90 supports the diaphragnrl and is packed for longitudinal movement in the casing K. A valve member 90 governs communication between the pipes L and 17 such valve. being carried by the diaphragm l and having an opening therethrough as indicated at 91. The opening at 91 is OOHtIOllHl. by the valve 92 carried by the casing 90. the arrangement being such that when the outlet from the heater is closed the diaphragm i occupies the position illustrated in Fig. 10, and the passage 91 through the valve 90 is opened. The valve 90 is provided with the stem 92 normally held in the position shown, by means of the springs 93,. and such stem has a 10st motion connection with the. stem of the gas valve 4 v The member 90 carrying the diaphragm is perforated as indicated at 94, so that the pressure in the heater is applied to the rear side of the diaphragm, while that from the inlet pipe L is supplied to the front face of the diaphragm.

It now the outlet from the heater is opened, the pressure upon the rear side of the diaphragm 1 is reduced and the valve 90 carried by the diaphragm moves to the left, thus permitting a flow of water from the pipe L .to the pipe 17 5 and through the heater, the water as it iiows from the lower coil of the heater passing through the connection N? and the. casing K to the hot water outlet pipe .M. Movement of the diaphragm 1 to the left causes the opening of the gas valve 4", permitting a supply of gas to pass to the burners of the heater, the

v movement being arrested as before, by the engagement of the valve member with the valve 92 on the casing 90. If during the operation of the heater the water flowing through the casing K rises above the predetermined temperature for which the thermostat is set, the expansion of the liquid in the thermostat causes the right hand end of the corrugated tube 86 to move to the right, thus moving the member 90 which carries the diaphragm-1 to the right and permitting the gas valve 4 to be closed by its spring 5. The lowering of the temperature produces a reverse or backward movement of the casing, thus allowing the gas valve to be again opened by the action of the water actuated diaphragm member 1. When the outlet from the heater is closed and the diaphragm is returned to its normal position by the spring 93 the valve 92 is open and the water is permitted to circulate between the inlet and outlet of the heater only through the openings 91 and 94.

In all the above forms of apparatus the temperature at which the thermostat acts to cut off the gas may of course be adjusted as desired, by adjusting the amount of lost motion between the gas valve stem and the parts engaging therewith, or by adjusting the position of the stops which determine the opening movement of the water actuated member, or by joint adjustment of both of the aforesaid parts.

Having thus described my invention andillustrated its use, what I claim as new and desire to secure by Letters Patent, is the fol-- lowing.

i. In an automatic water heater, a burner, a gas valve for controlling the supply of gas to the burner, water actuated means and thermostatic means for controlling the gas valve, with one of the said means carried bodily by the other means, the water actuated means being arranged to open the gas valve when the outlet of the heater is opened and the temperature of the water below a predetermined point, and the thermostatic means being arranged to close the gas valve without moving the water actuated means with respect to the means which carries it when such valve is open and the temperature of the water rises above a predetermined point.

2. In an automatic water heater, a burner, a gas valve for controlling the supply of gas to the burner, water actuated means and thermostatic means for controlling the gas valve, each of which has a movable element for controlling the gas valve by such movement, with one of said. means carried bodily by the movable element or" the other means, the water actuated means being arranged to open the gas. valve when the outlet of the heater is opened" and the temperature of the water below a predetermined point, and the thermostatic means being arranged" to close the gas valve without moving the water actuated means with respect to the means which carries it when such valve is open and the temperature of the water rises above a predetermined point.

3. In an .automatic water heater, a bu rner, a gas valve for controlling the supply of gas to the burner, a'movable member actuated by differences of water pressure caused by opening and closin the outlet from the heater and arranged to operate the gas valve, a thermostatic member gov= erned by the heated water and having a part adapted to move back and forth on variations of temperature in the water of the heater, and a connection between the said thermostatic part and the gas valve, one of the said members being carried bodily by the other member whereby its operation is controlled by such other member, the thermostatic'member being arranged to 0perate the gasvalve without moving the water actuated member with respect to the means which carries it. 4. In an automatic water heater, a burner, a gas valve for controlling the supply of gas to the burner, pressure mechanism including a reciprocating controlling member whose position is governed by differences of water pressure caused by opening and closing the outlet from the heater', a controlling thermostatic member securedto bneof the parts of the pressure mechanism, and a connection between the gas valve andHme of the said controlling members, the thermostatic means being arranged to operate the gas valve without moving the said control ling member with respect to the means which carries it.

5. In an automatic water heater, a burner, a gas valve for controlling the supply of gas to the burner, a movable water actuated member, and a thermostatic means carried bodily by the water actuated member and fmi prm'ied with an element for epening the s valve, the parts being arranged 50 that ten the eutlet from the heater is opened the tmnperature 0f the water beiew :1

X318? actuated member causes the lent to open the mite, tne gait aentafise Being moved back an forth ehenges in the pueitiqn at the gas by changes in texxzperature of the E11 an automatic water heater. :1 burner; :1 gas valve 501* centreiling the supply at gas to the burn-e a movable water actuated member, and a thermostatic means carried bi, by the water actuated member and givrm'ided. with 1m etement for opening the 1 :s waive, the parts being unranged so that E'hen. the eutlet from the heater opened and the tempemtm'e at the Water be /0w predetenzmxed POlIlt the mevement ot the Water actuated member causes the thermoietatic eiement to open. the valve, the said etement also bung moved back and ferth to jf l. .1 7 (ykv z o't- P O c \L-l/ (inm te ,4 uae 1103.401]. at :e aa valve by mwngee 1n temperature of the water Without movimz the water ectuateti member, and there being a 10st motien c011- nection between the said element anti the gas valve.

. 7. In an automatib water heater, a bu rner, normally yieldingly closed valtvefo'r c0ntrotting the supply of fuel to the burner, :1 mow-able member actuated by changes of water pressure when the outlet from the heater is opened, a thermostatcarried bodily by the said member and provided with an etel'nent fer opening the gas valve when the euttet from. the heater is opened and the movable member and thermostatic element are moved forward, the said element atse being moved back and faith to etfect movements at the gas valve and without it movement of the IQHESSUI'G actuated member by changes of temperature of the water.

In testimony whereof I t'z we hereunto sivned my name in the presence oithe two subscribed witnesses.

FRANK L. Q. RVADSWORTH.

"Witnesses ARcI-nvmz're: MARTIN, LE'AITIA A. MYERS. 

